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#include <stdio.h>

int findSum(int n)
{

    if (n % 2 == 0)

        return (n/2) * (n+1);

    else

        return ((n+1)/2)*n;
}
int main()

{
    int n;
    printf("Please Enter Value of N \n ");
    scanf("%d",&n);
    printf("Sum of N natural numbers: %d",findSum(n));
    return 0;
}



#include <stdio.h>
int evenSum(int n)
{

    return (n * (n + 1));
}
int main()
{
    int n;
    printf("Please Enter Value of N \n ");
    scanf("%d",&n);
    printf("Sum of first %d Even numbers is: %d",n,evenSum(n));
    return 0;
}






#include <stdio.h>
int oddSum(int n)
{
    return (n * n);
}
int main()
{
    int n;
    printf("Please Enter Value of N \n ");
    scanf("%d",&n);
    printf("Sum of first %d Odd numbers is: %d",n,oddSum(n));
    return 0;
}





#include <stdio.h>
#include <math.h>
int main() {
    float a, b, c;
    float root1, root2, imaginary;
    float discriminant;
    printf("Enter values of a, b, c of quadratic equation (aX^2 + bX + c): ");
    scanf("%f%f%f", &a, &b, &c);
    discriminant = (b * b) - (4 * a * c);
    if(discriminant > 0)
    {
        root1 = (-b + sqrt(discriminant)) / (2*a); root2 = (-b - sqrt(discriminant)) / (2*a);
        printf("Two distinct and real roots exists: %.2f and %.2f", root1, root2);
    }
    else
        if (discriminant == 0) {
            root1 = root2 = -b / (2 * a);
            printf("Two equal and real roots exists: %.2f and %.2f", root1, root2);
        }

        else if (discriminant < 0) {
            root1 = root2 = -b / (2 * a);
            imaginary = sqrt(-discriminant) / (2 * a);
            printf("Two distinct complex roots exists: %.2f + i%.2f and %.2f - i%.2f", root1, imaginary, root2,
                   imaginary);
        }

    return 0;
}




#include<stdio.h>
int main()
{
    int n,i; float c,big;
    printf("\nEnter the number of elements you wish to find the greatest element of: ");
    scanf("%d", &n);
    printf("\nEnter %d numbers :\n", n);
    printf("\tElement 1: "); scanf("%f", &big);
    for(i = 2; i <= n; i++)
    {
        printf("\tElement %d : ", i); scanf("%f", &c);
        if(big < c)
            big = c;
    }
    printf("\nThe largest of the %d numbers is %f ", n, big);
    return 0;
}